Mortising attachment for drill presses



Oct. 7, 1952 w. N. MOSS 2,612,915

MORT ISING ATTACHMENT FOR DRILL PRESSES Filed Oct. 6. 1948 m vE/v TOR WILLIAM N. MOSS AT'TORNE Y Patented Oct. 7, 1952 MORTISING ATTACHMENT For. DRILL ranssns William N. Moss, Vancouver, British Columbia, Canada Application October 6, 1948, Serial No. 53,069

1 Claim.

My invention relates to improvements in mortising attachment for a drill press.

The object of the invention is to provide a transmission housing capable of vertical movement with the quill of a drill press, in which means are provided for supporting a mortising chain and its sprocket train; to provide means for operatively connecting the sprocket train to the drill spindle, and to provide means for slidably supporting a foot from the transmission housing for preventing the wood being mortised from being split as the mortising cutters emerge from the mortise being out. A further object is to provide a mounting for the sprocket shaft which can be readily removed from the housing when so desired for the purpose of fitting a different chain sprocket or otherwise.

Referring to the drawings:

Figure 1 is a front elevational view of the invention attached to the quill of a drill press.

Figure 2 is a plan view taken on the line 2-2 of Figure l.

Figure 3 is an elevational view of the lower end of the transmission housing with a mortising chisel attached.

Figure 4 is a sectional view taken on the line 6-4 of Figure 2.

In the drawings like characters of reference indicate corresponding parts in each figure.

The numeral I indicates the bed plate of a drill press and 2 indicates the portion of the head in which the quill 3 is vertically movable in response to movement of the feed lever 5. A

,pair of lugs 6 are provided upon the opposite sides of the head 2 and support a pair of removably mounted vertical rods or guides 1. Detachably fitted to the lower end of the quill 3 by a bolt 9 is a transmission housing Ill which consists of a sleeve H in the base of which the drill spindle I2 is journalled, and extending to the front of said sleeve is a journal box l4 supporting a spaced outer bearing I and a slide support IS.

The drill spindle I2 is fitted with a mitre pinion-I1. A ball bearing I8 is supported in the journal box l4 and in this and the outer bearing I5 is journalled a horizontal driven shaft l9 having secured thereon a mitre gear in mesh with the mitre pinion and a sprocket 22. The shaft l9 and its bearings are held in position by a flange 23 and the bearings l5 and It, as well as the shaft mitre gear 20 and and sprocket may be withdrawn from the housing ID by simply removing the flange 23.

The transmission housing In is provided with a pair of diametrically disposed apertured arms 24 which slidably engage the vertical guides 1 to hold the housing against rocking movement about its vertical axis. Adjustably secured vertically upon the slide support I6 is a chain guard 2t and fitted around said guard is a mortise chain 2? which is driven from the sprocket 22. Slidably mounted in a lug 29 extending to one side of the housing H) is a stem 36 having at its lower end a socket 31 in which an obliquely pointed foot 32 is adjustably secured. The upper end oi the stem is fitted with a weight 33 which is adapted to hold the foot 32 in sufficiently firm cont-act with the surface of the work being acted upon by the mortising chain 21 to prevent splitting of the grain at the point where the chain emerges from the mortise being cut.

The transmission housing IE] is reduced at its lower end as at 35 to. the diameter of the quill 3, so that when desired a yoke 38, see Figure 3, may

be attached thereto. The yoke '36 is provided with legs 3'! spaced apart to allow a drill chuck 39 to be fitted to the drill spindle l2 and is provided with a sleeve portion M1 at its lower end in which the shank of a mortise chisel ll may be guided,

to its work by the usual feed lever 5 and the mortising chain is driven from the rotating drill spindle l2 through the horizontal shaft l9. As the transmission ill moves downwardly it will move along thestem 3!) of the foot 32. If it is desired to use the mortising chisel 4| instead of the chain, the housing will preferably be turned degrees to put said chisel to the front of the drill press and if necessary, the chain 21 and the chain guard 26 will be removed. The operating movement will obviously be in this case in response to reciprocating the drill spindle.

What I claim as my invention is:

A chain mortising attachment for a drill press having a head, a quill and a drill spindle, said attachment comprising a sleeve adapted for attachment to the lower end of said quill and havinga bearing at its lower end through which the lower end of the drill spindle projects, a horizontal shaft carried by said sleeve, said shaft being mitre gear driven from the drill spindle, a sprocket secured adjacent the outer end of said shaft, a slide support carried from said sleeve, 8. I

chain guide mounted upon the slide support, a mortising chain surrounding the sprocket and the chain guide, said chain guide being detachable 3 from the slide support to afford free access to Number the lower end of the drill spindle. 865,118 WILLIAM N. MOSS. 1,170,120 1,690,697 REFERENCES CITED 5 1 74 213 The following references are of record in the 2,464,660 file of this patent:

UNITED STATES PATENTS Number Number Name Date 1 138,467 621,026 Brown Mar. 4, 18 443,984 646,125 Meserve Mar. 27, 1900 4 Name Date- Muir Sept. 3, 1907 Slonaker Feb. 1, 1916 Palmu Nov. 6, 1928 Edmdnd Feb. 25, 1930 White Mar. 15, 1949 FOREIGN PATENTS Country Date Great Britain Feb. 12, 1920 Germany May 10, 1927 

